Autoionization electrons following double excitation of D2 in 2.4keV e−+D2 collisions: Experimental and theoretical evidence
Résumé
The electron spectra originating from ionization of D2 by impact of 2.4 keV electrons have been measured at various emission angles. After subtraction of the direct ionization background, three peaks are clearly visible in the electron energy range 1–20eV. The existence of these peaks is confirmed by theoretical calculations. Two of these peaks are due to autoionization of doubly excited states lying above the first and second ionization thresholds. The third peak is attributed to the strong interference between direct ionization and autoionization while the molecule is already dissociating.